linux-kernel - Re: s390 && user_enable_single_step() (Was: odd utrace testing results on s390x)

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Message-ID: <20100105154725.GB9376@redhat.com>
Date:	Tue, 5 Jan 2010 16:47:25 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Martin Schwidefsky <schwidefsky@...ibm.com>
Cc:	Roland McGrath <roland@...hat.com>, caiqian@...hat.com,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Jan Kratochvil <jkratoch@...hat.com>,
	linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
	utrace-devel@...hat.com
Subject: Re: s390 && user_enable_single_step() (Was: odd utrace testing
	results on s390x)

On 01/05, Oleg Nesterov wrote:
>
> Anyway. I modified the debugging patch a bit:
>
> --- K/arch/s390/kernel/traps.c~	2009-12-22 10:41:52.909174198 -0500
> +++ K/arch/s390/kernel/traps.c	2010-01-05 09:49:19.541792379 -0500
> @@ -384,6 +384,8 @@ void __kprobes do_single_step(struct pt_
>  	}
>  	if (tracehook_consider_fatal_signal(current, SIGTRAP))
>  		force_sig(SIGTRAP, current);
> +	else
> +		printk("XXX: %d %d\n", current->pid, test_thread_flag(TIF_SINGLE_STEP));
>  }
>
>  static void default_trap_handler(struct pt_regs * regs, long interruption_code)
> -------------------------------------------------------------------------------

Ah, please ignore. I guess TIF_SINGLE_STEP was already cleared by the caller
in entry.S

Oleg.

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